Wise 8WD521 Series 8" Base Lounge Seat is ideal for replacing worn out seats on your runabout, ski boat or fish n' ski model. Injection molded plastic frame. Marine grade UV and mildew treated vinyl. Embossed vinyl center. High compression foam padding. Popular colors look great in all ages of boats. Seat opens up for sunbathing. Storage underneath. Mounts directly to boat floor. Easy assembly.